In it, you can configure settings to make XP do backups to your HDA daily, weekly or monthly. This is done by going to Start -> All Programs -> All Programs -> Accessories -> System Tools -> Scheduled Tasks. If you have never done this, you will have to create a new scheduled task.

The first time it runs , you may select whether it will back up all your files now or later.

It saves your files in the form of .bkf files. Unlike Vista, you must use "Restore Files" in the Backup program.